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A: Viagra (sildenafil) is a prescription medication used to treat erectile dysfunction. Sildenafil citrate is designated chemically as 1-[[3-(6,7-dihydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo[4,3d]pyrimidin-5-yl)-4-ethoxyphenyl]sulfonyl]-4-methylpiperazine citrate and has the following structural formula: Sildenafil citrate is a white to off-white crystalline powder with a solubility of 3. Levitra acts similarly to Viagra regarding possible side effects and onset and duration of pharmacologic action.

If it is not treated right away, priapism can permanently damage your penis sudden vision loss in one or both eyes. If you are currently taking medication and are unsure of whether it is safe to take Viagra, you should consult a qualified medical professional before proceeding. It should be taken 30 minutes to an hour before it is needed, but can be taken up to 4 hours before it is needed. Twenty subjects received VIAGRA 50 mg, but only 19 subjects received matching placebo.

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Stephen Evans, a professor of pharmacoepidemiology at the London School of Hygiene and Tropical Medicine, said the small number of trials with pregnant women had limited the knowledge of medicines in pregnant women. "There have been other studies in this area, both involving preliminary work using animals and using pregnant women, and there was no indication that the treatment was dangerous based on previous research," Professor Evans said. Total maximum savings for this offer is $4200 per year.Viagra Sildenafil Side Effects This page contains important information about Viagra side effects – both common and less common.

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A: When taking more than one medication, it is important to make sure there are no drug interactions. Generic oral tablets are available for both conditions, but the brand-name drugs each treat only one of the conditions. Wie Oath und unsere Partner Ihnen bessere Werbung anbieten Um Ihnen insgesamt ein besseres Nutzererlebnis zu bieten, möchten wir relevante Anzeigen bereitstellen, die für Sie nützlicher sind. This is not a complete list of the side effects associated with Viagra. But if you remember just a few hours before your next scheduled dose, take only one dose. In addition, patients were asked a global efficacy question and an optional partner questionnaire was administered.

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Rarely reported side effects include: an erection that will not go away (priapism). There have been a few isolated reported incidents of heart problems in patients taking Viagra. Heart attacks, stroke, irregular heartbeats, and death have been reported rarely in men taking Viagra. Zrenner E "No cause for alarm over retinal side-effects of sildenafil." Lancet 353 (1999): 340-1 45. Taking sildenafil with a nitrate medicine can cause a serious decrease in blood pressure, leading to fainting, stroke, or heart attack.